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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbfeae0d8dc9802e06e56f8725f5c53da8033e2ebbc7542501ac0a2e6d3baca' 
  AND token = 'VTTXRhanhuoJyfDr3opkJy6uYoMIK9vLj1oBHflyFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}